A statistical study of the distribution of stars in the log Teff  log gN plane.
Abstract
A statistical study is made of the distribution of stars in the log T(eff)log gN plane based on the photometric data set of the Geneva system. To that end we made an analysis of the methods for deriving the atmospheric parameters T(eff) and log gN (the Newtonian acceleration of gravity) from different sets of photometric data, corrected for the influence of extinction. We found, using the Geneva photometric system, that the Newtonian gravity can only be determined with good accuracy for stars with effective temperatures below 10,000 K. We show the relations between luminosity class and gravity for stars with T(eff) values of 3.75 to 3.94 and compare these with the theoretically predicted radiative instability line of Gustafsson and Plez (1992).
 Publication:

Astronomy and Astrophysics Supplement Series
 Pub Date:
 September 1993
 Bibcode:
 1993A&AS..100..465A
 Keywords:

 Star Distribution;
 Statistical Analysis;
 Astronomical Photometry;
 Main Sequence Stars;
 Stellar Atmospheres;
 Stellar Color;
 Stellar Luminosity;
 Stellar Temperature;
 Subgiant Stars;
 Astrophysics